`pkgdown:::render_rmarkdown` fails with obscure error when `dev` set inside Rmd about pkgdown

[hadley]

Here's a simpler reprex that makes a simpler traceback:

format <- build_rmarkdown_format(
  pkg = as_pkgdown("."),
  name = "article",
  toc = TRUE
)
rmarkdown::render("vignettes/data-slices.Rmd", output_format = format)

That yields:

     ▆
  1. └─rmarkdown::render(...)
  2.   └─knitr::knit(knit_input, knit_output, envir = envir, quiet = quiet)
  3.     └─knitr:::process_file(text, output)
  4.       ├─xfun:::handle_error(...)
  5.       │ └─base::withCallingHandlers(...)
  6.       ├─base::withCallingHandlers(...)
  7.       └─knitr:::process_group(group)
  8.         └─knitr:::call_block(x)
  9.           └─knitr:::block_exec(params)
 10.             └─knitr:::eng_r(options)
 11.               └─knitr:::chunk_device(options, keep != "none", tmp.fig)
 12.                 ├─base::do.call(...)
 13.                 └─svglite (local) `<fn>`(...)
 14.                   └─svglite:::svglite_(...)

I think that implies that this might actually be an svglite issue, so I've filed r-lib/svglite#172. (At the least, I'd want to see what happens if svglite generates a better error before making changes to pkgdown.)

...

Re-looking at your original traceback, I see that this traceback is already included, albeit rather buried. I'll see if I can make it more clear.

[gavinsimpson]

Thanks for looking into this @hadley and raising this with issue with svglite